Well I just need a 2 week girlfriend
You're probably better off just meeting random people during the two weeks. If you are serious about the two weeks only, be upfront with the girl. Tell her NSA.
Well she could move back with me
Unless she is unattached in her current life, I am not sure she will just pack up her stuff and leave. This is certainly true if she does not know you.
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Yeah I just need a 2 week girlfriend